Respiratory filtering device



14. J. B. BHEDERMAN EAGQfififi RESPIRATORY FILTERING DEVICE Filed Jan.7, 1943 Fig.7 INVENTOR.

Jam/1 EBB/5051mm Patented July 23, 1946 UNITED STATES PATENT OFFICERESPIRATORY FILTERING DEVICE Joseph B. Biederman, Cincinnati, OhioApplication January 7, 1943, Serial No. 471,603

2 Claims. 1

- This invention relates to improvements in a respiratory filteringdevic and particularly to improvements on applicants copendingapplication Serial Number 408,627 and to improvements in the replaceablefiltering pad used therewith.

The principal object of this invention is the pr vision of a respiratoryfiltering device that is inexpensive to manufacture yet sturdy ofconstruction and easy to operate.

Another object of this invention is the provision of a filtering device,as above set forth, with which an improved filter pad may be employed toprovide a definite seal around the nose and mouth of the user.

Another object of this invention is the provision of a filtering devicethat will conform with the contour of the face of the user around thenose and mouth without uncomfortably clamping itself against the usersface.

A further and specific object is the provision of a replaceable filterpad for use with a respiratory filtering device that will not bunch andwill lie fiat between the device and the face of the user to form aperfect seal against air passing therearound to the nose and mouth ofthe wearer.

Other objects and advantages of the present invention should be readilyapparent by reference to the following specification considered inconjunction with the accompanying drawing forming a part thereof and itis to be understood that any modifications may be made in the exactstructural details there shown and described, within the scope of theappended claims, without departing from or exceeding the spirit of theinvention.

In the drawing:

Fig. l is a front elevation of a respiratory filtering device embodyingth improvements of this invention.

Fig. 2 is a, vertical sectional view through the device taken on line2-2 on Fig. 1.

Fig. 3 is a horizontal sectional view through the device taken on line33 on Fig. 1.

Fig. 4 is a fragmentary elevational view of a portion of the device asseen from line 4-4 on Fig. 2.

Fig. 5 is an enlarged fragmentary sectional view through the clamp ofthe device taken on line 5-5 on Fig. l.

Fig. 6 is a plan view of the filter pad as used in the filtering deviceof this invention.

Fig. '7 is an edge view of the filter pad illustrated in Fig. 6.

Throughout the several views of the drawing similar reference charactersare employed .to denote the same or similar parts. i

The respiratory filter of this invention comprises a, body member ID ofa general U shape having in effect arms H and I2 connected together by abase portion l3. The outer edges of the arms II and I2 are substantiallyregular in outline while the inner or opposed edges of said arms are cutaway as at I4 and I5 to outline the nose and mouth of th user. The saidcontoured edges of the arms are provided with an upturned flange 16 sothat a rounded edge is presented to the face instead of a sharp edge ofthe sheet metal from which the body member I0 is stamped.

The upper ends of the arms II and I2 are connected by an elastic memberII which as illustrated in the drawing is elastic fabric. In practicethe elastic member I! follow the contour of the wearers nose with end ofthe arms lying at the base of the nose.

As seen in Fig. 3 the mask body I 0 is transversely curved so as toconform to the curvature of the face of a user. In order to hold themask in position the arms H and I2 are respectively provided with apiercing resulting in an upturned hook I 8 and Hi to which,respectively, is removably attached a coupling 29 and 2| having betweenthem an elastic mask attaching bank or strip 22 which encircles the backof a users head.

Cooperating with the mask body [0 is-a wire frame 23 having, in frontelevation, the form illustrated in Fig. 1 which, as will be noted, hasan outline substantially identical with the opening of the U frame. Thewire frame 23 comprises an arcuate transverse portion 24 from whichdepends sides 25 and 26 contoured similarly to the. contours l4 and I5of the arms H and I2. Inte-- gral with and extending from the wire framesides 25 and 26 are arms 21 and 28 which project toward one another fora distance and then are rearwardly directed as at 29, The rear end ofthe arms 2! and 28 bend downwardly to provide legs 30 and 3| withtheirlower ends outwardly projected to form trunnions 32 and 33, as willlater be made clear.

The base l3 of the filte body member lll substantially centrally thereofis offset to provide a channel 34 of a width substantially equal to thedistance between the wire frame legs 3|] and 3|. The sides 35 and 3B ofthe offset 34 are adapted to be engaged by the wire frame legs and thesaid sides are each provided with an aperture 31 through which projectsthe trunnions 32 and 33.

By this construction the wire frame 23 is adapted to be oscillated fromthe position illustrated in full lines in Fig. 2 to the positionillustrated in dotted lines therein. With the frame in the dotted lineposition of Fig. 2 a, filtering pad 38, of Figs. 6 and 7, may be placedon the underside of the filter body for subsequent positioning. The wireframe 23 is oscillated from its dotted line position to the solid lineposition of Fig, 4 thereby. positioning the filter pad 38 outwardly ofthe nose andzlmouth of :a wearer while'l' having ,the marginal portionof the pad 38 between the filter bod portion In and face.

In order to retain the Wire frame 23 in its oper I ative position use ismade of a--1ocking devica illustrated most clearly in Fig. 4. Thelocking device comprises a locking membereoflzsubstans; tially T shapedformation comprising. a cross member 39 providing arms 40""an'd 4| "witha tongue 42 depending from the cross amembe'ri' from between the arms 40and M. The ends of the tarmssdflland .4 I are. upwardly ,bent or archedas at 43 to lie on thelupperrsurfaces of the legs and 3|. whenclampingthe-wire framein position. l In=orderuto bscillatetheclamping lmemberitiswconnected bya riv'etw 44 to thesbaseof the offset 34.

The. filter pad :38,Las. noted. above. engages with the .undersurface.of the vfilter body .10 and "the exceptior.beinglsomewhat larger. inarea. Ex-;

tending into the. pad from .its: ;lower edge a are, a pair of cuts 46and providing-between them a tonguelMiw In practice they tongue 48isdrawn down between the .wire frame legs 30 and 3t afe fordinga meansfor holding the. pad in position duringlthe oscillation-of-the framefrom thedottedto the solidiline;position.-of'Fig. '2 and-pre-' venting.abunchinglorl-upward movement of the saidpad by the-wire frame legs.which would occurif the pad were not provided With the tongue and, cutsand 41 whichlprovide passageways for thesaid legs.- Byw thisconstruction :the seal at the lower'end of the mask body, or across-thebase I3, is maintained instead of being broken as would be the case witha tongueless 'pada Th'efilter pad-38 maybe cut from any filteringmaterial on the -market; such ass-is. illustrated;

comprisinga wovenlgauze like layer 49 and a fibrous or: cotton: layer59. With this type.- of

filter the fibrous or cotton layer does the filtering and is ofconsiderable thickness with the woven fabric layer 49 acting merely as areinforcing backing for the filter.

For clearness in illustration the filter pad 38 is shown in certain ofthe views of the drawing in phantom lines.

From the foregoing it will be noted that there has been provided arespiratory filtering device comprisingx a single member: of sheet?material which may be-either metal-orpl'astic and of a general U shapeto lie below and around the nose and mouth of a person. Associated withthis singlewmember-is: a simple wire frame cap-able of being positionedahead of the single sheet member for holding a filtering pad in front ofthe respiratory. organs. It will further be noted that there hasbeen'provided a filtering pad of a 1. Ina device. of the class.described the "comet: bination ofla bodyv member hayingracentrallopening for. the respiratory organs comprising a base member andarms: attthe. ends of the baseI.mern-.

her, said base memberhhavin'gla channelwlikei offset, a wire framehavingrdepending.legsjoiir: naled in the channel wallsi for. movementbetwee the body member arms to a position aheadofcthe respiratory organsand a filter pad located in front of the wire frame and behind the body}member, and said filter pad having a tongue p0 tion extending between.the wire. frame legs whereby the saidfiltering pad exte'ndsatleast to.

the..bounding edge .of. the body member," and means for locking the wireframe in its forward position, comprising ai'T shaped member pivotallyvmounted in the offsetcchannel having-arms adapted to overlie thewire frame legs 'and-a tongue projecting below the body' member 2. In adevice of the class 'describedtlie com bination of a U shaped bodymember'adaptedito V have its arms disposed'oneach side-of themes-"'-piratory organs and its' base portion therebelo'w,

an elastic fabric connection between *the free ends of the arms foroverlying the -no'se;-a Wire 1 frame oscillatably mounted "on the base'of the U shape frame foroscillatory movement btween the arms to aposition ahead oi the 'U" frame, means-for locking the Wire frame in itsforward position, and a filterpaddisposed ahead of the wire frame andbehind the U shaped :body ,member and 'connectingielastic: fabric;andihav ing a tongue overlying the wire framerlockingl mechanism.

J OSEPH B. :FBIEDERMANI

